我还没有找到一个将Python WebSocket客户端连接到Plotly Dash的例子，我想知道设计它的最好方法是什么。我的Websocket服务器监听股票交易流的实现，看起来像这样：

class StockSocket:
    def __init__(self):
        self.underlying_symbol = underlying_symbol
        self.last_underlying_price = ''

    def on_message(self, ws, message):
        m = json.loads(message)
        self.last_underlying_price = str(m['last'])
        # I want to send this message to client here

    def on_error(self, ws, error):
        print(error)

    def on_close(self, ws, close_status_code, close_msg):
        print("### closed ###")

    def on_open(self, ws):
        payload = json.dumps({"symbol": self.underlying_symbol, "sessionid": self.sessionId})
        ws.send(payload)

    def run_forever(self):
        websocket.WebSocketApp("<market-feed-url>",on_open=self.on_open, on_message=self.on_message, on_error=self.on_error, on_close=self.on_close).run_forever()

def runWebsocket(sessionId, underlying_symbol):
    ws = StockSocket(sessionId, underlying_symbol)
    ws.run_forever()

我计划通过Python Flask服务器运行这个程序，然后让Dash WebSocket监听，但是我不太确定这个实现。
对于客户端代码，我的想法如下：

import dash_core_components as dcc
import dash_html_components as html
import dash_extensions as de
from dash import Dash
from dash.dependencies import Input, Output

# Create example app.

app = Dash(prevent_initial_callbacks=True)
app.layout = html.Div([
    dcc.Input(
        id="input", autoComplete="off"
        ),
    html.Div(id="msg"),
    de.WebSocket(url="ws://localhost:8000/", id="ws")
])

# Send input value using websocket.

send = "function(value){return value;}"
app.clientside_callback(            
            send,
            Output("ws", "send"),
            [Input("input", "value")],
        )

# Update div using websocket.

receive = "function(msg){console.log(msg.data); return \"Response from websocket: \" + msg.data;}"
app.clientside_callback(
            receive,
            Output("msg", "children"),
            [Input("ws", "message")]
        )

if __name__ == '__main__':
    app.run_server(host='0.0.0.0', port=8000, debug=True, use_reloader=False)

我的两个主要问题是：
1.如何使用Python WebSocket库将消息从服务器发送到客户端（文档很少）
1.客户端如何轮询服务器？
谢谢你！